image sensor by Pratik

Apr 26, 2018 Written by Pratik srivastava Digital Image sensor


                                   Digital Image sensor

. An image sensor or imaging sensor is a sensor that detects and conveys the information that constitutes an image

. t does so by converting the variable attenuation of light waves (as they pass through or reflect offobjects) into signals, small bursts of current that convey the information.

. Image sensors are used in electronic imaging devices of both analog and digitaltypes, which include digital cameras, camera modules, medical imaging equipment, night vision equipment such as thermal imaging devices, radar, sonar, and others. As technology changes, digital imaging tends to replace analog imaging.

.An image sensor Is typically a charg –couple device(CCD)ora

complementry metal –oxide-semiconductor (CMOS)



.Fundamentally, a charge coupled device (CCD) is an integrated circuit etched onto a silicon surface forming light sensitive elements called pixels. Photons incident on this surface generate charge that can be read by electronics and turned into a digital copy of the light patterns falling on thedevice.


.The image sensor employed by most digital cameras is a charge coupled device 

. The first working CCD made with integrated circuit technology was a simple 8-bit shift register.

. CMOS sensors are much less expensive to manufacture than CCD sensors. Both CCD (charge-coupled device) andCMOS (complementary metal-oxide semiconductor) imagesensors start at the same point -- they have to convert light into electrons.

. Currently, used types are semiconductor charge-coupled devices (CCD) or active pixel sensors in complementary metal–oxide–semiconductor (CMOS) or N-type metal-oxide-semiconductor (NMOS, Live MOS) technologies.

.The CMOS sensor is one of the key components of a digital SLR camera. Canon conducts development and production of CMOS sensors using proprietary technologies. Canon currently uses two different sizes of CMOS sensor: 35 mm full-frame and APS-C